client-lisp-rc

Arguments:
client-lisp-instance

This accessor returns (or modifies) the
client-lisp-rc slot of an instance of client-lisp. This slot is
initially nil. It is set to the return code
from the client Lisp image when the image is terminated.

In some OS environments and situations the value may be unreliable or
never set even when the client Lisp process has terminated.